A VTL (Virtual Tape Library) is a high capacity (terabytes to petabytes) disk-based backup storage system. To the backup software, it looks like a standard networked physical tape library or autoloader (tape robot, autochanger or jukebox). This allows them to be deployed as drop-in replacements for mechanical tape drives, with minimal disruption.
One alternative to a VTL for disk-based backup is a NAS (Network Attached Storage) or file server. Some storage arrays, such as the HP StorageWorks, can be configured as both VTL and NAS at the same time.
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